Caliber Lowpro Glides. Multi-Channel Trailer Glide System. An Economical Version Of The Number One Consumer Choice Trailer Glides System In The World... Multi-Glides. Lower Profile Design Enhances Expanded Use Of Trailer Without Removal Of Glides. Made From 100% Recycled Hdpe. Glide Channels Suspend Carbide Inserts To Create Friction-Free Loading And Unloading. Double Set Completes A Typical 10- 2 Place Trailer Packaged With Stainless Steel Attaching Hardware. Easily Installed With Simple Hand Tools In Approximately 15 Minutes. Protects Trailer Deck From Carbide Damage. Available In Black Only. Optional Extension Kit Available For 12 Trailers. Standard Width 5-7/8" Wide. 3/16" Deep Grooves. Center Grips Sold Separately. Single Unit-Wide Width-One 5 Piece. Stainless Steel Fasteners Sold Separately. For More Information On This Product Check Out This Video.